The girl, from the southern town of Knin, had only just started studying German at school and had been reading German books and watching German TV to become better, but was by no means fluent, according to her parents.
Since waking up from her 24 hour coma however, she has been unable to
speak Croatian, but is able to communicate perfectly in German.
Doctors at Split's KB Hospital claim that the case is so unusual, various experts have examined the girl as they try to find out what triggered the change.
Hospital director Dujomir Marasovic said:
"You never know when recovering from such a trauma how the brain will react. Obviously we have some theories although at the moment we are limited in what we can say because we have to respect the privacy of the patient."
Psychiatric expert Dr Mijo Milas added: "In earlier times this would have been referred to as a miracle, we prefer to think that there must be a logical explanation – its just that we haven't found it yet.
"There are references to cases where people who have been seriously ill and perhaps in a coma have woken up being able to speak other languages –sometimes even the Biblical languages such as that spoken in old Babylon or Egypt – at the moment though any speculation would remain just that – speculation – so it's better to continue tests until we actually know something."